CN114481473A - Thread take-up mechanism of sewing machine - Google Patents
Thread take-up mechanism of sewing machine Download PDFInfo
- Publication number
- CN114481473A CN114481473A CN202210202821.8A CN202210202821A CN114481473A CN 114481473 A CN114481473 A CN 114481473A CN 202210202821 A CN202210202821 A CN 202210202821A CN 114481473 A CN114481473 A CN 114481473A
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- Prior art keywords
- thread
- connecting rod
- sewing
- hook
- take
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B49/00—Take-up devices, e.g. levers, for the needle thread
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B49/00—Take-up devices, e.g. levers, for the needle thread
- D05B49/02—Take-up devices, e.g. levers, for the needle thread operated by cams or linkages
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention discloses a thread take-up mechanism of a sewing machine, which has the technical scheme that the thread take-up mechanism comprises a main shaft and a machine shell on a main body of the sewing machine, wherein a thread take-up lever and a needle rod are arranged on the main shaft, the thread take-up lever extends out of the side wall of the machine shell and swings up and down along a curve track, the needle rod passes through the bottom of the machine shell to extend out and does reciprocating motion in the vertical direction, and the extending end of the needle rod is provided with a machine needle; the sewing machine has the advantages that the sewing machine has a sewing thread compensation function, the appearance of unattractive sewing threads is prevented from being generated due to over-tight or over-loose sewing threads, meanwhile, the needle feeding accuracy of the machine needle is improved, the thread quantity is adjustable, the thread picking mechanism can be assisted to control the thread quantity, and excellent and smooth stitches can be sewn on fabrics with different thicknesses.
Description
Technical Field
The invention relates to the technical field of sewing machines, in particular to a thread take-up mechanism of a sewing machine.
Background
At present, thread take-up mechanisms are arranged in sewing machines, a long groove which extends up and down and allows a thread take-up lever to swing up and down is generally arranged on a shell of the sewing machine, and the thread take-up lever is driven by a main shaft in the sewing machine to do up-and-down reciprocating swing motion in the long groove; meanwhile, a main shaft in the sewing machine drives a needle to reciprocate up and down, and the function of thread take-up is realized through the matching action of the needle and the thread take-up lever. However, the above-mentioned prior art has drawbacks: its thread take-up mechanism structure is fixed, can not be fine adapt to thin material and thick material simultaneously, promptly: when thin materials and thick materials with different fabric thicknesses are sewn, stable take-up of machine needles and threads cannot be realized; if the take-up amount of the machine needle thread is less than that of the thin material, the phenomenon that the machine needle thread is not tightly taken up occurs when the thick material is sewn; if the take-up amount of the machine needle thread is more than the thick material, the phenomenon that the machine needle thread is too tight to take up and the thin material is wrinkled occurs when the thin material is sewn, a smooth and excellent sewing stitch can not be formed, and the sewing quality is poor. And the condition that the existing thread take-up mechanism pulls the needle easily still appears when the needle reciprocates up and down, namely when the needle is in the stage of needle setting, the sewing thread is too tight, so that the needle is bent, the needle setting error is caused, and the sewing quality is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the thread take-up mechanism of the sewing machine, which has the function of thread compensation, prevents the appearance of unattractive sewing threads caused by over-tight or over-loose sewing threads, improves the accuracy of needle setting of a machine needle, can adjust the thread quantity, can assist the thread take-up mechanism to control the thread quantity, and can sew excellent and smooth stitches on fabrics with different thicknesses.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a sewing machine thread take-up mechanism, includes the sewing machine main part, the sewing machine main part includes main shaft and casing, be provided with thread take-up lever and needle bar on the main shaft, the thread take-up lever stretches out the lateral wall of casing, does the orbit and is curved reciprocating motion from top to bottom, the needle bar passes the bottom of casing and stretches out, is the ascending reciprocating motion of vertical side to be provided with eedle, its characterized in that stretching out the end: the casing still is provided with thread trapper, pine line hook and alignment jig in one side that the take-up lever stretches out, the pine line hook passes through drive mechanism and is connected with the main shaft, the alignment jig sets up between thread trapper and take-up lever, be provided with the slotted hole on the alignment jig, the slotted hole passes through the screw and can dismantle with the casing and be connected, the alignment jig still just crosses the line hole to being provided with two, the pine line hook is located two cross between the line hole, the sewing thread passes in proper order thread trapper, cross the line hole, pine line hook and eedle.
The invention is further configured to: the transmission mechanism comprises an eccentric cam, a thread loosening connecting rod, a thread loosening crank and a transmission shaft, the eccentric cam is connected with the main shaft, one end of the thread loosening connecting rod is connected with the eccentric cam bearing, the other end of the thread loosening connecting rod is hinged with the thread loosening crank, one end of the transmission shaft is fixedly connected with the thread loosening hook, and the other end of the transmission shaft is connected with the thread loosening crank shaft.
The invention is further configured to: the thread take-up mechanism comprises a first connecting rod, a second connecting rod and a third connecting rod, a thread take-up lever and a needle rod are connected to the thread take-up lever and the needle rod respectively, the transmission mechanism comprises the first connecting rod, the second connecting rod and the third connecting rod, the thread take-up hook is hinged to the first connecting rod, the third connecting rod is hinged to the thread take-up lever, the first connecting rod and the third connecting rod are hinged to the second connecting rod, and the hinge shaft of the third connecting rod and the second connecting rod is eccentrically arranged.
The invention is further configured to: the stretching end of the thread releasing hook is bent upwards to form a hook shape and is positioned below the sewing thread, so that the sewing thread can be stably lifted when the thread releasing hook moves upwards, and no external force is applied to the sewing thread when the thread releasing hook moves downwards.
The invention is further configured to: the shell is further provided with a through hole, the thread loosening connecting rod penetrates through the through hole to extend out, and the thread loosening crank and the transmission shaft are arranged outside the shell.
The invention is further configured to: the end part of the thread releasing hook is in a hook shape bent downwards and used for hooking the sewing thread and is positioned above the sewing thread, so that the thread releasing hook can hook the sewing thread when moving downwards, and external force is not applied to the sewing thread when moving upwards.
The invention is further configured to: the thread releasing hook swings up and down in a reciprocating manner along with the rotation of the main shaft.
In conclusion, the invention has the following beneficial effects:
compared with the prior art, the sewing machine needle is provided with the thread loosening hook and the transmission mechanism, when the main shaft rotates, the thread loosening hook is matched with the needle rod and the thread take-up lever to move, so that the sewing thread is hooked and pulled, and the sewing thread is released when the machine needle is fed, so that the sewing thread on the thread take-up lever and the machine needle is in a loose state subsequently, the machine needle cannot be excessively tensioned by the sewing thread, and the problems that in the prior art, the sewing thread is excessively tight, the machine needle is bent, the feeding error is caused, and the sewing quality is influenced are solved.
Meanwhile, the invention also provides an adjusting frame, the adjusting frame is provided with a slotted hole, a screw is arranged in the slotted hole and connected with the shell, an operator can position the adjusting frame in the slotted hole through the adjusting screw to change the position of the adjusting frame, the position of the sewing thread passing through the slotted hole can be changed after the position of the adjusting frame is changed, the swinging stroke of the thread releasing hook is fixed, and the distance of the thread releasing hook capable of pulling the sewing thread is changed after the position of the sewing thread is changed, namely the thread adjusting amount is changed.
Drawings
FIG. 1 is a schematic view of an outer structure of a thread take-up lever side of the present embodiment;
FIG. 2 is a schematic view of an external structure of a through hole side in the present embodiment;
FIG. 3 is a schematic view of an internal structure of the present embodiment;
FIG. 4 is a schematic view of the transmission mechanism of the embodiment with the thread releasing hook in the low position;
FIG. 5 is a schematic view of the transmission mechanism of the embodiment in a high position of the thread releasing hook;
FIG. 6 is a schematic view showing an external structure of a second sewing machine body according to the present embodiment;
FIG. 7 is a schematic diagram of a side wall structure of the second housing of the present embodiment;
FIG. 8 is a schematic view of the second embodiment;
FIG. 9 is a schematic view of the low point structure of the second needle bar of the present embodiment;
FIG. 10 is a schematic view of the high point structure of the second needle bar of this embodiment.
Reference numerals: 1. a sewing machine main body; 101. a main shaft; 102. a housing; 2. a take-up lever; 3. a needle bar; 4. a needle; 5. a wire clamping device; 6. loosening the thread hook; 7. an adjusting bracket; 701. a long slot hole; 702. a wire passing hole; 8. a crank; 9. a thread take-up connecting rod; 10. a needle connecting rod; 11. a first link; 12. a second link; 13. a third link; 14. an eccentric cam; 15. a thread releasing connecting rod; 16. a thread releasing crank; 17. a drive shaft; 18. and a through hole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 1-5, the sewing machine comprises a sewing machine body 1, the sewing machine body 1 comprises a main shaft 101 and a machine shell 102, a thread take-up lever 2 and a needle rod 3 are arranged on the main shaft 101, the thread take-up lever 2 extends out of the side wall of the machine shell 102, the extending end of the thread take-up lever swings up and down along a curve, the needle rod 3 extends out through the bottom of the machine shell 102 and reciprocates in the vertical direction, and a machine needle 4 is arranged at the extending end of the needle rod 3; the shell 102 is further provided with a thread clamping device 5, a thread releasing hook 6 and an adjusting frame 7 on one side of the thread take-up lever 2, the adjusting frame 7 is arranged between the thread clamping device 5 and the thread take-up lever 2 and located below the thread take-up lever 2, the thread releasing hook 6 is connected with the main shaft 101 through a transmission mechanism, sewing threads sequentially penetrate through the thread clamping device 5, the adjusting frame 7, the thread take-up lever 2 and the machine needle 4, therefore, when the machine needle 4 moves upwards in sewing work, the thread releasing hook 6 descends to hook and pull down the sewing threads passing through the two thread passing holes 702, when the machine needle 4 moves downwards, the thread releasing hook 6 releases the sewing threads pulled before, the sewing threads at the position of the machine needle 4 are in a relaxed state, no pulling force is generated on the machine needle 4, and the accuracy of the position of the lower needle is guaranteed.
Further, referring to fig. 4 and 5, the transmission mechanism includes an eccentric cam 14, a thread releasing connecting rod 15, a thread releasing crank 16 and a transmission shaft 17, the eccentric cam 14 is connected with the main shaft 101, one end of the thread releasing connecting rod 15 is connected with the eccentric cam 14 by a bearing, the other end is hinged with the thread releasing crank 16, one end of the transmission shaft 17 is connected with the thread releasing hook 6 by a shaft, and the other end is connected with the thread releasing crank 16 by a shaft, therefore, in the process of rotating the main shaft 101, the eccentric cam 14 rotates to drive the thread releasing connecting rod 15 connected with the eccentric bearing to do linear motion vertical to the main shaft 101 direction, the linear motion of the thread releasing connecting rod 15 drives the thread releasing crank 16 to swing, the thread releasing crank 16 is connected with the transmission shaft 17 by a shaft, the swing is converted to the small amplitude reciprocating rotation on the transmission shaft 17, finally, the transmission shaft 17 transmits the torque to the thread releasing hook 6, so that the thread releasing hook 6 swings up and down at the far end, to realize reciprocating motion.
Further, referring to fig. 1, the adjusting frame 7 is provided with a long slotted hole 701, the long slotted hole 701 is detachably connected with the casing 102 through a screw, the adjusting frame 7 is also provided with two wire passing holes 702, the wire releasing hook 6 is located between the two wire passing holes 702, the adjusting frame 7 can have a certain adjusting space due to the design of the long slotted hole 701, the amount of the thread can be changed by only loosening the screw and changing the positions of the long slotted hole 7 and the screw, the adjustment can be performed according to the fabrics with different thicknesses, and the sewing stitches are smooth and beautiful.
Example two:
referring to fig. 6 and 7, a thread clamping device 5, an adjusting bracket 7, a thread releasing hook 6, a thread take-up lever 2 and a machine needle 4 are arranged on one side of a machine shell 102 at the head position of a sewing machine body 1, sewing threads pass through the thread clamping device 5 upwards and then pass through thread passing holes 702 on the adjusting bracket 7 and the thread releasing hook 6 between the thread passing holes 702, then continue to pass through the thread passing hooks downwards, pass through the thread take-up lever 2 and finally reach the machine needle 4; the adjusting frame 7 is provided with a long slotted hole 702, the adjusting frame is connected with the machine shell 102 through a bolt penetrating through the long slotted hole 702, the height position of the adjusting frame 7 can be changed according to the required thread quantity when in use, the height of the sewing thread is changed by the height change of the adjusting frame 7 because the sewing thread penetrates through the thread passing hole 702 on the adjusting frame 7, the picking distance of the thread releasing hook 6 is fixed, the end part of the thread releasing hook 6 is in a hook-shaped design, the sewing thread can be picked up upwards when the sewing thread is upwards, the sewing thread is not influenced when the sewing thread is downwards, and if the height of the sewing thread is higher, the thread picking quantity of the thread releasing hook 6 is reduced, so that the control and the adjustment of the thread quantity are realized; the invention realizes the adjustment of the thread amount through the thread loosening hook 6, solves the problem that the sewing accuracy is influenced because the needle 4 is bent due to over-tight sewing thread in the prior art, and simultaneously can adapt to fabrics with different thicknesses through the adjustment of the thread amount.
Further, referring to fig. 8 to 10, the main shaft 101 drives the crank 8 at the end to rotate when rotating, the crank 8 is hinged with a thread take-up connecting rod 9 and a needle connecting rod 10, and the needle connecting rod 10 is hinged with the needle rod 3; the rotation of the crank 8 drives the thread take-up connecting rod 9 to move and drives the thread take-up lever 2 and the third connecting rod 13 thereon to move, after the third connecting rod 13 is driven, the third connecting rod 13 drives the second connecting rod 12 which is eccentrically hinged, the rotation of the third connecting rod 13 is converted into the up-and-down swing of an arc track and is transmitted to the first connecting rod 11, and the first connecting rod 11 controls the thread loosening hook 6 which is hinged with the first connecting rod 11 to carry out the thread take-up movement, thereby realizing the adjustment of the thread amount of the sewing thread.
Further, referring to fig. 9 and 10, when the needle 4 of fig. 9 is at the low position, the thread releasing hook 6 is also at the low position, and no thread take-up operation is performed, and when the needle 4 is at the high position of fig. 10, the thread releasing hook 6 is also at the high position, and the sewing thread is taken up; through the action of the thread loosening hook 6 and the needle rod 3 and the needle 4, the sewing thread can not be dragged to the needle in the needle inserting process from a high position to a low position, and the needle inserting accuracy is ensured
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides a sewing machine thread take-up mechanism, includes sewing machine main part (1), sewing machine main part (1) includes main shaft (101) and casing (102), be provided with thread take-up lever (2) and needle bar (3) on main shaft (101), the lateral wall that casing (102) were stretched out in thread take-up lever (2), do the orbit for curvilinear up-and-down reciprocating swing, needle bar (3) pass the bottom of casing (102) and stretch out, do the ascending reciprocating motion of vertical side to be provided with eedle (4) at the end that stretches out, its characterized in that: casing (102) still are provided with thread trapper (5), pine line hook (6) and alignment jig (7) in one side that take-up lever (2) stretched out, pine line hook (6) are provided with drive mechanism and are connected with main shaft (101), alignment jig (7) set up between thread trapper (5) and take-up lever (2), be provided with slotted hole (701) on alignment jig (7), slotted hole (701) can be dismantled with casing (102) through the screw and be connected, alignment jig (7) are still just crossing line hole (702) to being provided with two, pine line hook (6) are located two cross between line hole (702), and the sewing thread passes in proper order thread trapper (5), cross line hole (702), pine line hook (6) and eedle (4).
2. The thread take-up mechanism of a sewing machine as claimed in claim 1, wherein: the transmission mechanism comprises an eccentric cam (14), a thread loosening connecting rod (15), a thread loosening crank (16) and a transmission shaft (17), the eccentric cam (14) is connected with a main shaft (101) in a shaft mode, one end of the thread loosening connecting rod (15) is connected with a bearing of the eccentric cam (14), the other end of the thread loosening connecting rod is hinged to the thread loosening crank (16), one end of the transmission shaft (17) is fixedly connected with a thread loosening hook (6), and the other end of the transmission shaft is connected with the thread loosening crank (16) in a shaft mode.
3. The thread take-up mechanism of a sewing machine as claimed in claim 1, wherein: the automatic thread take-up mechanism is characterized in that a crank (8) is arranged on the main shaft (101), a thread take-up connecting rod (9) and a machine needle connecting rod (10) are arranged on the crank (8), the thread take-up connecting rod (2) and a needle rod (3) are respectively connected onto the thread take-up connecting rod (9) and the machine needle connecting rod (10), the transmission mechanism (8) comprises a first connecting rod (11), a second connecting rod (12) and a third connecting rod (13), the thread take-up hook (6) is hinged to the first connecting rod (11), the third connecting rod (13) is hinged to the thread take-up connecting rod (9), the first connecting rod (11) and the third connecting rod (13) are hinged to the second connecting rod (12), and a hinged shaft of the third connecting rod (13) and the second connecting rod (12) is eccentrically arranged.
4. The thread take-up mechanism of a sewing machine according to claim 3, wherein: the stretching end of the thread releasing hook (6) is bent upwards to form a hook shape and is positioned below the sewing thread, so that the sewing thread can be stably lifted when the thread releasing hook (6) moves upwards, and external force is not applied to the sewing thread when the thread releasing hook moves downwards.
5. The thread take-up mechanism of a sewing machine as claimed in claim 2, wherein: the machine shell (102) is further provided with a through hole (18), the thread releasing connecting rod (15) penetrates through the through hole (18) to extend out, and the thread releasing crank (16) and the transmission shaft (17) are arranged outside the machine shell (102).
6. The thread take-up mechanism of a sewing machine as claimed in claim 2, wherein: the end part of the thread releasing hook (6) is in a hook shape bent downwards and used for hooking the sewing thread and is positioned above the sewing thread, so that the thread releasing hook (6) can hook the sewing thread when moving downwards and does not apply external force to the sewing thread when moving upwards.
7. The thread take-up mechanism of a sewing machine as claimed in claim 1, wherein: the thread releasing hook (6) swings up and down in a reciprocating manner along with the rotation of the main shaft (101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210202821.8A CN114481473A (en) | 2022-03-02 | 2022-03-02 | Thread take-up mechanism of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210202821.8A CN114481473A (en) | 2022-03-02 | 2022-03-02 | Thread take-up mechanism of sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114481473A true CN114481473A (en) | 2022-05-13 |
Family
ID=81484053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210202821.8A Pending CN114481473A (en) | 2022-03-02 | 2022-03-02 | Thread take-up mechanism of sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114481473A (en) |
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2022
- 2022-03-02 CN CN202210202821.8A patent/CN114481473A/en active Pending
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Effective date of registration: 20230817 Address after: 325000 Room 502, Building B, Antai Building, Nanpu Street, Lucheng District, Wenzhou City, Zhejiang Province Applicant after: Wang Xiaoyan Address before: 325000 room 2149, building C, science and technology business incubator, Wenzhou high tech Industrial Development Zone, Wenzhou City, Zhejiang Province (self declaration) Applicant before: WENZHOU YITONG ELECTRICAL AND MECHANICAL CO.,LTD. |